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With their matching yellow t-shirts, crossed arms and glasses, you can see why people might think these two are twins.

But they are actually strangers brought together for a one-off documentary due to air next week.

Leading experts are set to test seven doppelgängers brought together from across the world for the show.

They believe that for every face there are seven people that have almost exactly the same features.

And social media has fuelled a global phenomenon of people searching for their 'twin'.

Leading experts are set to test seven doppelgängers brought together from across the world for the show

That then led to leading twin-experts at the Department of Twin Research at St Thomas' Hospital, London taking an interest, with the show set to air on Channel 4 next Wednesday, December 7.

Researchers at the centre have been studying similarities between identical twins for years but now they're interested in seeing what they can learn from non-related pairings.

In the hour long documentary, Finding My Twin Stranger, cameras follow the scientists and seven pairs of twin strangers as they meet, get to know each other and undergo tests to reveal which pair is the most identical doppelgängers.

Researchers believe that for every face there are seven people that have almost exactly the same features

Social media has fuelled a global phenomenon of people searching for their 'twin'

A fascinating trailer for the show that has been airing on Channel 4 shows incredibly similar-looking people chatting with one another.

Lucy Leveugle, Commissioning Editor for Factual Entertainment at Channel 4 said: "With social networks meaning the world is effectively a smaller place, this programme documents and heightens the phenomenon that are twin strangers.

"With extraordinary visuals, it's a great play along too – spot the difference."

A fascinating trailer for the show that has been airing on Channel 4 shows incredibly similar-looking people chatting with one another

And Tayte Simpson, Director of Programmes and Executive Producer, Mentorn Media added: "In a time of the selfie culture, people's curiosity with finding their doppelgänger has become a fascinating obsession.

"With the experts at St. Thomas' Hospital we hope that [the programme] will prove that we are more alike than we know and shed light on how we perceive each other."